"Panta Rhei" (everything flows) but how?

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Low drag car aerodynamics from autospeed.com

Slipping easily through air

by Julian Edgar

Imagine for a moment that air was as visible as water.

As every car passed, you would be able to see the swirls and whirls of air disturbed by its passage. Some cars would drag behind them an enormous wake, larger even than the frontal area of the car. Others would have only a small area of disturbed air trailing them, these cars slipping easily through the air.

If air could be seen, you can be certain that car aerodynamics would have never gone out of fashion – after all, boats with flat fronts are pretty rare!